// Copyright (C) 2025 Kumo inc.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//

#ifndef ROTHAR_PEGTL_TYPE_LIST_HPP
#define ROTHAR_PEGTL_TYPE_LIST_HPP

#include <cstddef>

#include "config.hpp"

namespace rothar
{
   template< typename... Ts >
   struct type_list
   {
      static constexpr std::size_t size = sizeof...( Ts );
   };

   using empty_list = type_list<>;

   template< typename... >
   struct type_list_concat;

   template<>
   struct type_list_concat<>
   {
      using type = empty_list;
   };

   template< typename... Ts >
   struct type_list_concat< type_list< Ts... > >
   {
      using type = type_list< Ts... >;
   };

   template< typename... T0s, typename... T1s, typename... Ts >
   struct type_list_concat< type_list< T0s... >, type_list< T1s... >, Ts... >
      : type_list_concat< type_list< T0s..., T1s... >, Ts... >
   {};

   template< typename... Ts >
   using type_list_concat_t = typename type_list_concat< Ts... >::type;

}  // namespace rothar

#endif
